I personally would exclude curly leaf pondweed if I could in my 4 ponds, but it got going strong in one of my ponds, but I credit the papershell crayfish for it being under control now. I also credit a heathy mix of marginal plants from keeping the algae under control in my first two ponds. My second two ponds have not yet had the fertility to feed an alae bloom, but unlike the first two, they are almost exclusively spring fed. Curly leaf pondweed is an exotic invasive species.